To be fair, didn't you think the people who were supporting Obama were stupid to begin with?
I don't think your telling them they are still stupid is really going to convince any of the die hards.
And I don't think it's stupidity as much as being completely misinformed to a level where much of what they know simply isn't so.
After having looked at this again, you are correct....needed to follow the complete sentence....tho, "you" would have been better.
Another product of state run public schools.
"Your" was the best correct word for this context.